Feat/cache status headers

[AndreyErmilov]

Closes #221

[codecov]

Codecov Report

❌ Patch coverage is 87.47433% with 61 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.33%. Comparing base (7e77f7f) to head (7b79e6b).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
hitbox-core/src/context.rs	84.14%	13 Missing ⚠️
hitbox-http/src/cache_status.rs	93.75%	13 Missing ⚠️
hitbox-tower/src/layer.rs	38.88%	11 Missing ⚠️
hitbox-backend/src/composition/context.rs	50.00%	6 Missing ⚠️
hitbox-backend/src/composition/format.rs	25.00%	6 Missing ⚠️
hitbox-reqwest/src/middleware.rs	45.45%	6 Missing ⚠️
hitbox-core/src/value.rs	85.71%	4 Missing ⚠️
hitbox-core/src/response.rs	66.66%	1 Missing ⚠️
hitbox-http/src/response/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #269      +/-   ##
==========================================
+ Coverage   84.20%   84.33%   +0.12%     
==========================================
  Files         136      136              
  Lines        9435     9845     +410     
==========================================
+ Hits         7945     8303     +358     
- Misses       1490     1542      +52     

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